<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
  <title>Document</title>
  
 <style>
 *{
  padding: 0;
  margin: 0;
 }
div.div{
    width: 0;
    height: 0;
    border-top:10px solid red;
    border-bottom:10px solid transparent;
    border-left:10px solid transparent;
    border-right:10px solid transparent;
}

 </style>
</head>
<body>
 
  <div>
    <img src="images/img/banner1.jpg" alt="">
  </div>
</body>
</html>